Vulnerability · Published May 18, 2026 · Assigned by VulnCheck

CVE-2026-41949Dify < 1.14.2 Authorization Bypass via File Preview Endpoint

Medium 5.9

In plain English

A medium-severity authorization bypass via user-controlled key in dify from langgenius. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities).

Severity (CVSS 3.1)5.9Medium

Exploit odds (30 days)0.4%top 62.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Dify before version 1.14.2 contains an authorization bypass vulnerability in the file preview endpoint that allows any authenticated user to read up to 3,000 characters of any uploaded document across all tenants and workspaces using only the file's UUID. Attackers can access the /console/api/files/{file_id}/preview endpoint with an intercepted file UUID to extract sensitive content from documents without ownership or workspace permission verification. NOTE: Dify Cloud allows unauthenticated free self-registration, making account creation trivially accessible to any attacker.

Affected products (as reported)

Vendor	Product	Versions
langgenius	dify	0 – before 1.14.2

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

References

https://www.zafran.io/resources/difytap-zafran-discovers-how-attackers-can-silently-wiretap-ai-data-across-tenants-on-a-platform-powering-1m-apps technical-description, exploit
https://huntr.com/bounties/d50a0240-7951-4939-b989-9bded66c7682 technical-description, exploit
https://github.com/langgenius/dify/releases/tag/1.14.2 release-notes
https://github.com/langgenius/dify/pull/35797 issue-tracking
https://github.com/langgenius/dify/commit/432a6412a3fdb30ce48003d699b90cc7d890df20 patch
https://www.vulncheck.com/advisories/dify-authorization-bypass-via-file-preview-endpoint third-party-advisory